Fix error when Korean text contains regexp special characters. (#4022)

.github/contributors/b1uec0in.md

@@ -0,0 +1,106 @@
+# spaCy contributor agreement
+
+This spaCy Contributor Agreement (**"SCA"**) is based on the
+[Oracle Contributor Agreement](http://www.oracle.com/technetwork/oca-405177.pdf).
+The SCA applies to any contribution that you make to any product or project
+managed by us (the **"project"**), and sets out the intellectual property rights
+you grant to us in the contributed materials. The term **"us"** shall mean
+[ExplosionAI GmbH](https://explosion.ai/legal). The term
+**"you"** shall mean the person or entity identified below.
+
+If you agree to be bound by these terms, fill in the information requested
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+
+Read this agreement carefully before signing. These terms and conditions
+constitute a binding legal agreement.
+
+## Contributor Agreement
+
+1. The term "contribution" or "contributed materials" means any source code,
+object code, patch, tool, sample, graphic, specification, manual,
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+
+    * you hereby assign to us joint ownership, and to the extent that such
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+    licensing arrangements;
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+7. Please place an “x” on one of the applicable statement below. Please do NOT
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+    actual authority to contractually bind that entity.
+
+## Contributor Details
+
+| Field                          | Entry                |
+|------------------------------- | -------------------- |
+| Name                           | Bae, Yong-Ju         |
+| Company name (if applicable)   |                      |
+| Title or role (if applicable)  |                      |
+| Date                           | 2019-07-25           |
+| GitHub username                | b1uec0in             |
+| Website (optional)             |                      |

spacy/lang/ko/__init__.py

@@ -51,12 +51,15 @@ def try_mecab_import():
 
 
 def check_spaces(text, tokens):
-    token_pattern = re.compile(r"\s?".join(f"({t})" for t in tokens))
-    m = token_pattern.match(text)
-    if m is not None:
-        for i in range(1, m.lastindex):
-            yield m.end(i) < m.start(i + 1)
-        yield False
+    prev_end = -1
+    start = 0
+    for token in tokens:
+        idx = text.find(token, start)
+        if prev_end > 0:
+            yield prev_end != idx
+        prev_end = idx + len(token)
+        start = prev_end
+    yield False
 
 
 class KoreanTokenizer(DummyTokenizer):

spacy/tests/lang/ko/test_tokenizer.py

@@ -5,7 +5,8 @@ import pytest
 
 # fmt: off
 TOKENIZER_TESTS = [("서울 타워 근처에 살고 있습니다.", "서울 타워 근처 에 살 고 있 습니다 ."),
-                   ("영등포구에 있는 맛집 좀 알려주세요.", "영등포구 에 있 는 맛집 좀 알려 주 세요 .")]
+                   ("영등포구에 있는 맛집 좀 알려주세요.", "영등포구 에 있 는 맛집 좀 알려 주 세요 ."),
+                   ("10$ 할인코드를 적용할까요?", "10 $ 할인 코드 를 적용 할까요 ?")]
 
 TAG_TESTS = [("서울 타워 근처에 살고 있습니다.",
               "NNP NNG NNG JKB VV EC VX EF SF"),